We study the effects of vertical vibrations on non-wetting large water sessile drops flattened by gravity. The solid substrate is characterized by a finite contact angle hysteresis (10-15 degrees). By varying the frequency and the amplitude of the vertical displacement, we observe two types of oscillations. At low amplitude, the contact line remains pinned and the drop presents eigen modes at d...

Nonuniform evaporation from sessile droplets induces radial convection within the drop, which produces the well-known "coffee-ring" effect. The evaporation also induces a gradient in temperature and consequently a gradient in surface tension, generating a Marangoni flow. Here we investigate theoretically and experimentally the thermal Marangoni flow and establish criteria to gauge its influence...

Surface free energy (SFE) plays an important role in microfluidic device operation. Photosensitive glasses such as APEX offer numerous advantages over traditional glasses for microfluidics, yet the SFE for APEX has not been previously reported. We calculate SFE with the Owens/Wendt geometric method by using contact angles measured with the Sessile drop technique. While the total SFE for APEX is...

Using a reactive force field ~ReaxFF!, we investigated the structural, energetic, and adhesion properties, of both solid and liquid Al/a-Al2O3 interfaces. The ReaxFF was developed solely with ab initio calculations on various phases of Al and Al2O3 and Al-O-H clusters. Our computed lattice constants, elastic constants, surface energies, and calculated work of separation for the solid-solid inte...

Acoustic-fluid interactions not only has had a long history but has recently experienced renewed scrutiny because of their vast potential for microscale fluid and particle manipulation. Here we unravel a fascinating and anomalous ensemble of dynamic 'acoustowetting' phenomena in which a thin film drawn from a sessile drop first spreads in opposition to the acoustic wave propagation direction. T...

Abstract Changes in nanostructure morphology and size may result very different surface wettability. In this research, the impact of morphological parameters on wetting dynamics ZnO nanostructured layers is studied. Six morphologies are chosen to determine specific processes nanostructures: nanoneedles, small diameter rods, large nanotubes, nanoplates, plain thin films. Wetting investigated usi...

Abstract Evaporation progress of a macroscopic-scale sessile droplet with the pinned triple line on heated isothermal substrates has been experimentally investigated in terrestrial gravity, order to study interface effect, heat and mass transfer behaviours during phase change process. The experiments were carried out closed chamber which environment temperature pressure regulated. contact radiu...

Biophysical property and water evaporation retardation through a lipid nanofilm can be altered by model tear protein topical ophthalmic formulation. Evaporation rate dynamic surface pressure were measured using sessile drop technique. Water evaporations from 5 individual solutions, their mixture, 6 formulations quantified. nanofilms spread on electrolyte assessed. Model solution reduced evapora...

• Thermophysical and surface properties of eight different lubricants were measured. The behaviour polyalphaolefins ester-based compared. Heat capacity values used to test the validity two predictive methods. are important understand which ones appropriated for industrial conditions expected. families analysed: (PAO6, PAO20, PAO32 PAO40) four lubricants. Specific heat capacity, density, tension...